Valve-control mechanism



T. w. STONE. VALVE CONTROL MEC l-HWISM. APPLICATION FILED JULY 2!. 1919. 1,358,977. Patented ept 28, 1920.

4 SHEETSSHEET 1- erzicrv 2% fia T. W. STONE. VALVE CONTROL MECHANISM. APPLICATION FILED JULY 21,1919. f ,;353 977, Patentedsept. 28, 1920.

4 SHEETS-SHEET 2.

T. W. STONE. VALVE CONTROL MECHANISM.

APPLICATION FILED JULY 21,1919. 1,353,977.

4 SHEETS-SHEET J OPE/V GPEN OPE/V 68 57 I I 651 69 9/9gI95 1 2/ k 5 93 I 6 90 9a 9 96 PURGE v IJPQDOW/Y \S flCK VQLVE BEA/51.1957- M'a BLFS'T CLOSED DOWN CLOSED CLUJED CLOSED 64K 63 I 77&U67&Z07

dnwaz Patented Sept. 28, 1920.

T. W, STONE. VALVE CONTROL MECHANSSM.

I APPLICATION FILED JULY 21. IJld, l I 7 1,353,977, I Patenfddbept. 28,192Q.

4 slwsrs SHEET 4 5 66 UNITED STATES THOMAS W. STONE, 0F FORT ill/'AYNE, INDIANA, ASSIGNOR TO WESTERN CONSTRUCTION CO1VI?ANY, OF FORT \RMLYNE. INDIANA, A

OF INDIANA.

GAS CORPORATION VALVE-CONTROL MECHANISM.

Application filed July 21,

To (M w ham it may concern:

Be it known that I, THOMAS \V. STONE, a citizen of the United States, residing in Fort Wayne, in the county of Allen and State. of Indiana, have invented a new and useful Improvement in ValveControl i dechanism, of which the following is a specification. 4

This invention relates to a valve control mechanism for gas making machines, oi apparatus, and has one especially valuable application in a. water gas machine. It will be undersood, however, that the invention is capable of other valuable applications than the specific use herein-mentioned and described in the ensuing specification.

A highly important object of the invention is the provision of a unitary manuallycontrolled means for opening the blast valve which controls "the blast tel the generator, and, subsequently opening the stack valve, thereby permitting the stack valve to open shortly after the generator blast is opened and eiiectin-g a saving of the entire volume of gas in the machine at the time when the generator blast is turned on. At the com- ,pletion of a run, there is present in the entire machine a large volume of good gas,

and it the stack valve be opened at exactly the same instant as the generator blast, the good gas would be blown by the blast out the stack and consequently would be wasted. The present improved manually-controlled means permits this good gas to be blown back through the water seal into the scrubber and condenser, instead of out the stack, and at the same time insures opening of the stack valve before the blast can reach the water-seal and mingle with the gas in the scrubber and condenser. It is highly l1I1 portant that the blast of air be prevented from entering the scrubber or condenser, as this would produce an explosive mixture in the scrubber and condenser. vithprobable disastrous results.

A further object of the invention is the provision of means tor effecting a. finely ad justed control of the blast to the cerbureter thereby insuring a proper" proportion of air in the carbureter to the incompletely consumed gas discharged from the generator. at the time when the generator blast is opened.

Another object of the invention is the provision otan exceedingly simple and efti-- predetermined Specification of Letters Patent. Pgpbgnt Sept 28 inf/3Q,

1819. Serial No. 312,294.

cient interlock for the various valve control levers which absolutely prevents operation of any or all of said levers other than in a successive order in conformity with the exigencies of proper operation of a gas makingmachine.

lVith the above and other objects in view the invention consists in certain novel a1.- rangeinents, constructions and combinations of parts hereinafter described in preterred form and particularly pointed out in the claims at the end of the specification.

In the drawing:

Figure l a diagrammatic elevational view of a water gas machine equipped with a valve control mechanism constructed in accordance with the present nvention.

Fig. is a diagrammatic plan view of the apparatus illustrated in Fig. 1.

Fig. 3 is a plan viewot the control lever station.

Fig. 4 is a side elevation of the same.

Fig. 5 is a vertical section taken in a plane indicated by the line 5-5 of Fig. 4.

Fig. 6 is a fragmentary enlarged horizontal section taken in a plane indicated by the line 66 ot Fig. 5.

Fig. 7 is a tragmentar enlarged horizontal. section taken in a plane indicated by the line 77 of Fig. 5.

In the illustrated embodiment of the ii:- vcntion. the valve control mechanism is c" pecially adapted for use in connection with a water gas machine, and for convenience the present description of the valve control mechanism will be confined to this use of the invention. Features of constriurtion of the valve control mechanism are, however readily susceptible of other valuable applications and it is manifest that the scopc of the invention is by no means confined to the specific use and specific en'ibmliment herein described.

Referring to the drawing and more par ticularly to Figs. 1 and 2. there is shown a water gas machine. or set. which embodies in its construction the following essential. elements: A generator 11. provided with the,

are of the well-known constructions embodying essentially two chambers filled with checker brick for storing up heat while the blast is on, which heat is utilized in. the gas carburation and mixing in the subsequent run. Any suitable means for supplying oil or other gas enriching media to the carbureter may be employed. At the top of the super-heater there is provided a discharge pipe 16, having a branch 1?, the latter leading to a water seal 18. The water seal '18 is in turn connected by means of a discharge pipe 19 with a scrubber 520, see Fig. 2. and said scrubber 20 is connected. by a pipe nipple 21 with a condenser The top of the dischargepipe 16 leading from the superheater may be opened. and closed by a stack *alve 23. Said stack valve 23 consists esscn-- tially of acoverplate .24 adapted to fit over the top of the discharge pipe 16 and pivot ed at 25 in a suitable upright 26. Connected with. the cover-plate 24 at its pivotal point is an operating link 27. the opposite end of which is pivoted to the upper end of a pressurc-opcratcil piston 28. The piston 28 is provided with the usual head, not shown which works in a cylinder 30 and 1'6- sponds to pressure supplied to the upper end of the cylinder 3 to open the stack valve and conversely to pressure supplied to the lower end of the cylinder to close said stack valve. Above the discharge pipe lb. is positioned a stack 3 through which the gases and n'oducts of combustion from the super heater pass when the stack: valve 23 opened.

The generator 11 is constrimted so as to be capable of up and down runs. that is to say when on the up run the steam passing through the mass of glowing fuel in the generator enters from the bottom and the gas generated as a result of the chemical reaction between the steam and the glowing tucl lischarges from the top; whereas on the down run, the steam enters at the top of the generator and the resultant gasdischarges from the bottom. This change in direction of ilov; of the gas in the generator is effected by means of the main or up and down run valve 32. Said valve 32 embodies in its construction a prcssurc cvlini'lcr 33. within which works the usual piston, not shown. The valve piston. it will be understood, controls a. port in the pipe nipple 12. and a second port in (.(HIHDHIIiCHtiOD with the vertical pipe 84. the latter being con nected by means of a short pipe union with the lower end of the generator chamber. When the piston in the cylinder 33 is in the down position, as vievvedin Fig. 1. the pipe union 12 is open to permit passage from the upper portion of the generator into the carburetor and concurrently the v in tical pipe 34 is shut oil'from the generator to prevent passage of gas from the lower esser? end of the generator. Extending horizontally of the machine is a blast pipe 36 which leads to the vertical pipe 34 and is connected. therewith at a point located just above the short pipe union 85. Also connected with the main blast pipe 36 is a branch 37 leading to the carburetor 13. Separate valv are provided for controlling the blast supplied by the pipe to the generator and to the carbureter namely: A generator blast *alve 38 and a carinireter blast valve 39. Both of these valves are preferably of the gate type respectively provided with cylinders a l) and 41, having pistons which in the up position operate to open the valves and which in the down position operate to close the valves.

In a water gas machine, as above 0011- structed, the cycle of operation is as follows:

The up and down run valve 32 is operated to the up-run position; the stack valve 23 is opened to permit the gases from the superheater to pass through the stack; the generator blast valve 38 is open permitting the blast to pass into the bottom of: the generator; the carlmreter blast Valve is open to admit secondary air to the carbureter. iVith the valves in the above stated position, the operation continues for pproximately tour or live minutes and during this cycle of the operation the hot gases and products of combustion from the generator pass out of the lop ot' the generator into the carbureter. where all} HHCOHSUIHQLL or partially consumed. portion'pt the gas is burned in the secondary air supply by the. carburcter blast. The whole volume of the hot products of combustion passes through the checker brick in the carbureter and through the superhcater to..tbe stack, thereby storing up in the carburete and super-heater a great amount of heat for the subsequent run. As soon as theblast cycle of the operation is completed, the ncxt'portion of the cycle is carried out, this being generally known as taking oil the blast and putting on the run. The carburctcr blast valve is closed; the generator blast valve is closed; the stack valve is closed; as the main valve is in the up-run position. steam is admitted under the fire in the generator through the steampipe 111 so that the gas passes out of .the top of the generator into the carbureter where it is enriched by oil which thoroughly volatilizes and interniixes with the lean gas from the generator, the mixture passes through the hot checker brick in the carburetor-chamber and super-heater chamber. Finally the gas discharges through the outlet 16 and the branch 17 to the water seal 18 from which it passes to the scrubber 20 and condenser 22. If the run be a down run, the operation is exactly similar, with the exception that the main valve is in the down-run position and thesteam is admitted to the upper end of the generator chamber. through the steam pipe 112 with the result that the lean gas passes out the lower end of the generator into the vertical pipe 34 and subsequently into the upper end of the carbureter chamber. At the end of the run the above described cycle of operation is repeated, that is a shift is made which is called taking 05 the run and putting on the blast. lhis is accomplished by shutting off the steam; opening; the stack valve; opening the generator blast valve; opening the carburetor blast valve; the blast operation then proceeds as heretofore stated.

In the operation of a water gas machine according to the above-cycle, it is important that the up and down run or main valve be always in the up-run position before the stack valve, the generator blast valve and the carbureter blast valve be opened. Similarly it is important that the stack valve be in the open position approximately concurrently with the opening of the generator blast valve, and that in turn the generator blast valve be in the open position before the car bureter blast valve is opened. Conversely it is important that the carbureter blast valve be closed before the generator blast valve and also the generator blast valve before the stack valve is closed. 'lfnese considerations are absolutely essential to the safe manipulationlof the machine for the obvious reason that if any of the blast valves be open'd for any appreciable extentwhile the stack valve is closed, the/blast will be blown back into the scrubber and condenser where it will mix with the gas and form an explosive mixture.

lVhile safety in operation demands that the stack valve be opened before the blast valves are opened, in order to prevent the blast from reaching the scrubber and condenser, on the other hand if at the end of a run the stack valve be opened before the blast valve, the entire volume oi good gas remaining in the machine will be blown out of the stack. Hence in oroer to avoid waste of this good gas it is essential that the stack valve he opened a suilicient interval after the op'enin; ot' the blast valve to blow the good gas back into the scrubber and condenser.

The stack valve must open, however, before any air can reach the scrubber and condenser.

The present invention provides an im-.

proved valve control mechanism for operating the several valves concerned in the operation of the machine from a central. station with great ease of manipulation. Furthermore, the valve control mechanism is equipped with interlocking devices which absolutely insure the operation of the several valves according to the proper successive order above stated. The invention 'additionally provides an auxihsrv valve control whichlead respectively to the lower and in which permits opening of the generator blast valve just before the stack valve opened, so as to conserve the good gas remaining in the machine after a run.

The valve control station 42 may be lo rated at any suitable point in the machine or apparatus within convenient reach ot an operator. Said station 42 comprises preferably, a suitable rectangular casing; -13 the top of which is closed by a cover-plate The cover-plate el l is provided with a plurality of yokes 45 on which are pix 1 similar number of valve control levers each lever being provided at its lower end with a horizontal portion 47 which pivoted intermediate its ends at l8 between the two branches of a yoke 45. In the present invention, there are five levers l6 pivoted on a valve casing cover d4, said levers being a purge lever, an up and down run or main valve lever. a stack valve lover. a generator blast valve lever, and a warble reter blast valve lever. The opposite ends of the horizontal portion 47 of each lever are connected by pivoted links 50, with the upper ends of valve stems 51, 52, which extend through glands 53, 5-1, fitted in the cover 44, into the interior of the valve casing 4:3. The lower ends of said valve stems 51, 52, are provided with valve heads 56 which work in vertical chambers 57, 58 formed in the valve casing;- 41 Preiferal said chambers 57, 58, are lined with bushings 59, 60. It will be understood that the valve stems 51, 52, ot' the several are equipped with valve heads 56, work ing in chambers 57, 58, all alike in construction. The severa-l'chambers 5'7, 55%. the valve casing communicate with an inlet chamber 61 extending across the tops of the chambers 57, 58, and the lower ends ct said chambers 57, 58, all communicate with an outlet chamber 62 extending across the bottom of said vertical chamber 5?, The fluid under' pressure. such as water, is admitted to the inlet chamber ill by means of an tnlet pipe 63 and the fluid from the out let chamber 62 exhausts through an outlet pipe 64. Communicating with the several vertical chambers 57 through holes at formed in the bushing 59 are lay-passes us which respectively lead to a series oi pipes 67. Also communicating with the lIlllQllOlS of the several vertical chamliiers 5R throne;

holes 68 in the bushings 60, are hy-p; respectively leading to a series oi? pipes *l.

The pipes 67, 70, 01. the carbureter bllever 46 are respectively connected by nu of suitable pipe unions with pipes 'Z'li p 1'- ends of the carbureter blast valve atrng cylinder 41; the pipes 61'. 7Q generator blast valve are connected by means of suitable pipe unions with line pipes 73, 74, leading respectively to lower lib and upper ends of the generator blast valve operating cylinder l0; the pipes 67, 70, of the stack valve operating lever are connected by means of line pipes 75, 76, leading re spectively to the upper and lower ends of the stack valve operating cylinder 30; the pipes 67. 70, of the up and down run valvecontrolled lever are respectively connected by means of pipes 77, 78, with the lower and upper ends of the up and down run valve operating cylinder 33; the pipes 67, '70, of the purge valveoperating lever are connected by means of line pipes 79. 80, with supplementary line -pi pes 81. 82. Line pipe 81 leads both to the lower end of the generator blast valve. cylinder 38 and the upper end of the stack valve cylinder 30; line pipe 82 leads to the upper and lower ends of said respective cylinders 38, 30.

The several levers 46 are provided with an interlocking means for preventing operation of said levers in any other order than that in conformity with proper gas machine operations. For this purpose the several levers are provided with interlocking lugs which compel their operation in a predetermined successive order and lock all of the levers against operation until the first lever concerned in the operation of a gas making machine is operated to a position in accordance with the cycle set forth above. Referring now more particularly to Figs. 3 and 4, the purge lever 46 is provided with a horizontal lug: 83 havin; at its end a cutaway portion 84 adapted to interlock with a complementary cut-away portion 85 of a lug 86 carried by the up and down run lever, whenever the up and down run lever is in any position other than the. up-run position, i. c. for directing the flow up through the generator. The up and down run lever is provided with a lug 87 having a cut-away portion 88 adapted to interlock with cutaway portion 89 of a companion lug 90, carried by the stack valve lever, when the up and down run lever is in any position other than up-run position. Similarly the stack valve lever is provided with a lug 91 having a cut-away portion 92 for interlocking the engagement with a. cut-away portion 93 of a lug, 94 carried by the generator blast valve, when the stack valve lever is in any position other than open position; in turn the generatorblast lever is provided with a. lug 95 having a cut-away portion 96 for interlocking engagement with a companion cut-away portion 97 of a lug 98 carried by the carburetor blast lever whenever the gen erator blast lever is in any position other than open position.

With the above interlocking lug construction the up and down run lever must be shifted to the up-run position before the stack valve lever can be shifted to open position; the generator blast lever cannot be shifted to open position until'the staclrvalve lever has been so shifted; and finally the carburetor blast lever cannot be shifted to open position until the generator blast lever has been so shifted. Conversely the carbureter blast lever must be closed before the generator blast lever; the generator blast lever must be closed before the stack valve lever; and the stack valve lever must be closed before the up and down run lever can be shifted to the down-run position. The interlocks carried by the levers thus absolutely compel the-proper cyclic operation of the gas making machine, 2'. e. when the blast is put on, the flow must be up through the generator, the stack valve must be opened, the generator blast then opened and finally the carburetor blast. In taking oil the blast and putting on the run the carbureter blast is closed, next the generator blast, finally the stack valve is closed. With the stack valve lover in the closed position the up and down run lever can be shifted to up or down run position as desired, pro vided however the purge let er is also in the closed position. As stated the purge lever controls the admission of fiuid'pressure to both the stack valve cylinder and the generator blast cylinder. This purge lever can only be shifted to the open position when the up and down lever is in the up position. When the purge lever is opened, the generator blast first opened and shortly thereafter the stack valve closes, this operation taking, place in the manner which will here'- inafter appear. The effect produced by operating the several levers 46 to the open or closed position is the same with regard to the several" valve operating cylinders,

which said leverrespectively controls. As

suming that a lever 46 be shifted to a dotted line position shown in Fig. 5, the right hand piston head 55 thereof is depressed and the left hand piston head 56 thereof is elevated. This operation throws the bypass 66 in communication with the inner chamber 51 and concurrently the bypass 69 in communication with the outlet-chamber 62. A result pressure will flow from the inlet pipe 63 to the pipe 71, for example, leading to the lower end of the can bureter blast valve-operating cylinder 41 thereby causing the piston in said cylinder to elevateand open the valve. The pressure above the piston flows back through the pipe 72 to the by-pass 69 and thence to the outward chamber 62 through which it will be discharged through the outlet pipeG l. When the lever 46 is thrown to the reverse position as indicated by the dotted lines in Fig. 5, the pipe 71 will be brought into communication with the outlet pipe 6% and the pipe 72 concurrently into communication with the inlet pipe 63 thereby lowering the piston in the carburetor operated cylinder and closing said valve. the up and. down run lever, stack valve lever and the generator blast lever is exactly the same as above described. l l hen the purge valve lever is open 1 id pressure. flows from the inlet pipe 63.

o the generator valve cylinder all and the upper end of the stack valve cylinder 30. will be noted the stack valve is made .ably heavier than the generator blast valve and hence more fluid pressure :.,uired to operate the stack valve piston -he generator blast valve piston. As the gei'ierator blast valve opens advance of the stack valve.

generator blast valve piston is to the pipe 81 leading both to the lower end soon as -e extreme up position the pressure will flow to the staclr valve cylinder and eilect. an 20 immediate o ening ot said valve.

The inveution,a.lso provides an auxiliary valve for permitting the carbureter blast to move slowly to full open position after the generator blast has been. opened. in some cases it is not desirable to turn on the full carburetor blast during the early stages of the blasting operation, for the reason that when the generator blast is firs turned on the products from the generator chamber 39 are practically'fully consumed and at this time the effect of turning on the carbureter blast would be to reduce the temperatilre of the mirbureter and the mi ler-heater. Subsequently, however, partially consiuned prediuzts pass into the carbureter and it is desirable to burn these products in the carburetor in order to attain a. complete heating el For efiecting this result a leak Iect. valve, such as is shown in Fig. 6. is em- 40 ployed. The inlet- 63 communicates by means of a bypass 99 with a valve chamber 100, the latter in turn communicating by means of a lay-pass 'llll with the pipe 67 leading to the pipe 71, through which pres sure flows to open the carburetor valve. Within the valve chamber 100 is a valve seat 1.02 provided with. a conical passage-way 108. A needle valve llll enters the conical passage-Way 103. Said needle valve 104: is

screw-threaded, as at 105, in the valve cham her, and is also provided with an operating handle 106.

1n the operation of. the machine, the carbureter blast valve will be opened about half-way of its travel by holding the can bureter blast valve operating lever in the open position until the carbureter blast valve is approximately one-half opened. 'lhis operating lever will then be moved into the central or neutral position, so that, so far as the operating lever is concerned, there would be no tendency for the carburetor blast valve to open farther. lVhile in this position, the air admitted through the halt-open carbua reter blast valve will be sufficient to consume The operation of increase or decrease the amount of leak ago through the valve seat 102 to a v 'binetion: a gas generator; a stack adapted all of the combustible gas passing from generator to the carburetor at the start oi" the blast. As the blast continues, however, the amount of combustible gas coming from the generator will gradually increase. By If! turning the operating handle 106, the needle valve lOl-may be adjusted to permit leakage of fluid pressure from the inlet e 13 into the pipe 71, and this leakage will cause the carbureter blast valve to increase its .53 opening gradually in proportion to the increase in the amount of combustible gases coming over from the generator.'

Whether or not this rate of increase in the blast valve opening is the proper amount can be observed by the operator, who will note the color of the flame at the top of stack. If the. rate is not correct, he v:

through the leak valve and elite adjust this valve on one or tworuns, the leak valve will be. setin such position as to require vc y little adjustment thrbugh the remain ing runs. throughout the Play. The needle valve 104 permits adjustment of the lea line degree, thereby permitting an opera ce to determine with great accuracy. the grad ual opening ot' the carbureter blast valve:

ll ithin pipe 81 are check valves 10?, 188, permitting flow from pipe 7 9 into the b anches of said pipe on both sides of pipe 79; also within pipe 82 are check 'alves' lllj, Ill). permitting flow from both branches of pipe 82 into pipe 80. These. check valves prevent the operation of the purge lever from affecting the operation the regular stack valve and generator blast valve pressure lines. I

The invention is herein above set forth as embodied in a particular form or constructiou, but may be variously embodied within the scope of the claims hereinafter made.

What is claimed is: I

1. In a. gas making apparatus, in combi nation: a gas generator; a stack adapted to communicate therewith; a. blast pipe leading to said generator; a blast valve coin generator is maintained prior to the open ing of said stack valve; substantially as specified.

2, In a gas making apparatus. in conito communicate therewith; a blast pipe lead" ing to said generator; pressure-operated blast valve controlling the blast to the generator; a stack valve adapted to be opened by a relatively greater pressure than said 33o blast valve; and means for admitting fluid pressure simultaneously'to both said valves, whereby the stack valve opens at an automatically determined interval after the opening of the aforesaid blast valve, to maintain a blast through the generator prior to the opening of said stack valve;

substantially as specified.

3. In a gas making apparatus, in combination: a gas generator; a stack adapted to communicate therewith; a blast pipe leading to said generator; a pressure-operated blast valve controlling the blast to the generator; a stack valve adapted to be opened by a relatively greater pressure than said. blast valve; and a unitary manually-con trolled means for admitting fluid pressure simultaneously to both said valves, whereby the stack valve opens at an automatically determined interval after the opening of the aforesaid blast valve, to maintain a blast through the generator prior to the opening of said stack valve; substantially as specified.

v 4:. In a gas making apparatus, in combination: a gas generator; a stack adapted to communicate therewith; a blast pipe leading to said generator; a pressure-operated blast valve controlling the blast to thegenerator; a stack valve adapted to be opened by a relatively greater pressure than said blast valve; pressure-line connections for admitting fiuid pressure simultaneously to both of said valves; and single manually-controlled lever for controlling the flow oi. fluid pressure in said pressure-line connections, whereby the stack valve opens at an automatically determined interval, after the opening of the aforesaid blast valve, to.

maintain a blast through the generator prior ,to the opening of said. stack valve; substantially as specified.

5. In a gas making apparatus, in combination: a gas generator; a stack adapted to communicate therewith; a blast pipe lead ing to said generator; a pressure-operated blast valve controllingtthe blast to the genorator; a stack valve adapted to be opened by a relatively greater pressure than said blast valve; pressure-line connections for admitting fluid pressure simultaneously to both of said valves; and means for con; trolling the flow of fluid pressure in. said pressure-line connections, whereby the stack valve opens, at an automatically determined interval after the openingo'f the aforesaid blast valve, to maintain a blast through the generator prior to the opening ot said stack valve; substantially as specified.

6. In a gas making ap aaratns, in combi nation: a generator; a stack adapted to communicate therewith; a blast pipe leading to said generator; a blast valve controlling the blast to the generator; a stack valve adapted to open the stack; valve means for gasses? selectively directing the flow up or down through said generator; and means, operable only When said valve means is set for up-fiow through the generator, for opening the blast valve and at an automatically dermined interval thereafter opening the stack valve; substantially as specifier,

7. Ina gas making apparatus, in combina 'tion: a gas generator; a stack adapted to nation: a gas generator; a stack adapted to communicate therewith; a blast pipe leading to said generator; a. pressure-operated blast valve controlling the to the gen-- erabor; a stack valve adapted to be opened by a relatively greater pressure than said blast valve; valve means tgr sel i ely directing the dew up or down th generator; and means, a said valve means is set for .l'lI -fi? the generator, for admitting fluid or me simultaneously to both said valveaivhe the stack valve opens at an automatically determined inter al after the opening of the aroresaid blast alve, to maintain a blast througl rthe generator prior to the opening of said stack valve: substantially as specified.

9 in a making apparatus, in combination: a gas generator; a stack adapted to communicate therewith; a blast pipe leading to said generator; a pressureooerated I bkaet valve controlling the'biast V to the gene ator; a stack valve adapted to be opened by a relatively greater pressure than said blast valve; valve means for selectively directing the flow up or down through said generator; and a unitary manually-controlled means, operable only when said valve means is set vfor up-fiovv through the generator, for admitting fluid pressure simultaneously to both said valves. whereby the stack valve opens at an automatically determined interval after the opening of the aforesaid blastvalve, to maintain a blast through the generator prior to the, opening of said stack valve; substantially as spegified.

. ll). in a gas making apparatus, in comhi-. nation: a gas generator; a stack adapted to communicate therewith; a blast pipe leacing to said generator; :1 pressure-operated blast valve controlling the blast to the gen- Lee-se ue";

,1 greater pressuie than said last valve; ure-iiue couneeiieue 15o: (imitiiny fluid PIESSUIi-E simuituueousiy to l vu-ves; valve means for selectively flew up or down through said end a siugie manuallv-eoiitreiled .ievei. operable only when said valve means is set for up-i'low though the generates,

l ii'itul fluid pressure to said preesusre-luie eounectime whereby the stack J; euimnutieelly determined the opening of the aforesaid 1e, '50 maintain a. blast eluough. the

'" prior to the opening of said sleek valve; substzmtisl y specified.

'11. i u zing; apparatus, in combi- .flliiiOhI an and down rue valve; a stick vsive' :1 blast velve; a curbur'e'ter eive; ievers; individually operable at bless Wiii eeum'oiilng the operation of said valves; interlocking devices interposed 31 said levers for locking the L weweeri stuck val e generator lelass lever, and csrourese best level against operation exceptwheu ile up '31 down run lever is in u vesieiozz; substenefiiaily as specified.

1 gas 1 upon;- *-s, in eombi- W e sieelz blast vexve; e csreureter "'viduaily operable an: opera ion of said .Lerioelxing devices interposed en up-luu posistatus, in combiun vaive; a sieei. valve; CQIl'LlElJBI w iucliviciueiiy epe'zeble at operation of 4 devices interposed stud releasable by nugcontrolling she operation of the stack,

valve; substantially as specified.

14. In s making apparatus, in combination: a eerbureter; a biust line leading to said carbureter; a pressure'mpemteci valve for opening and closing said blast line; fluid gr-essur lines for supplying pressur to operate suio valve; a leve for controlling the flow in said pressure lines; and manuiy-eoutrolled means for admitting fluid pressure to said iiue in quantities reduced with respect to those supplied by operation of said lever.

15. In a gas making apparatus, in combination: a carburetor; a blast line leading to said cmlim'ei'er; 2L psessure-operated valve for opening and closing; said blast line; a fiuii pressure line for supplying pressure to open said valve; :1 second fluid. pressure line for supplying pressure to close said veiw; a pressure supply source; a lever for eonnecting either of said fluid pressure lines with' said pressure supply'source; and a needle valve interposed between said pressure supply source and fluid pressure line for opening said valve.

16. in a gas making apparatus, in combination: a arl'uirecer; s biesi line leading to eerbureter; e pressure-operated valve for opening and closing said blast line; fii'iiclpress line for supplying pressure to open said valve; a second fluid pressure line for supplying); pressure to close said valve; a "HQSSUE'G supply source; e lever for em! meeting either of said fluid pressure lines s: 'd pressure supply source; and 2.

with.

11 mauuullvecijusteble neecile valve interposezl STONE.

noivmiemx A. TILL mp2 

